. Evolution; its nature, its evidences, and its relation to religious thought . t, but something of lUoOFS FROM EMIUiYOLOGY. 109 A B the Mime kind is found also in the evolution of eachclass. The earliest reptiles, the earliest birds, and theearliest mammals had smaller and less perfectly organ-ized brains than their aearest congeners of the presentday. This is shown in the accompanying figures ( and 58). To carry out one example more perfectly :In the history of thehorse family, in con-nection with the chang-es of skeletal structurealready described (page108), we have also cor-respondi
. Evolution; its nature, its evidences, and its relation to religious thought . t, but something of lUoOFS FROM EMIUiYOLOGY. 109 A B the Mime kind is found also in the evolution of eachclass. The earliest reptiles, the earliest birds, and theearliest mammals had smaller and less perfectly organ-ized brains than their aearest congeners of the presentday. This is shown in the accompanying figures ( and 58). To carry out one example more perfectly :In the history of thehorse family, in con-nection with the chang-es of skeletal structurealready described (page108), we have also cor-responding changes inthe size and structureof the brain ; pari pas-su with the improve-ment of the mechan-ism we have also in-creased engine-powerand increased muscu-lar energy and there-fore increased activityand grace. The brainof a modern horse,though not very large, is remarkable for the FlG- 57.—a, brain of extinct Ichthyornis ; b, modern tern. complexity of its con-volutions. The great energy, activity, and nervous ex-citability of the horse are the result of this 170 EVIDENCES OF THE TRUTH OF EVOLUTION.
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